Imaging lens, imaging apparatus, and information device

摘要

An imaging lens includes a plurality of lenses, wherein a surface on an image side of a lens on an object side and a surface on the object side of a lens on the image side of two lenses arranged adjacently and separately from each other face each other across an air space, the air space is termed an air lens, a shape of the air lens is defined such that the surface on the image side of the lens on the object side is taken as a surface on the object side of the air lens and the surface on the object side of the lens on the image side is taken as a surface on the image side of the air lens, and an air lens positioned on a most object side and an air lens positioned on a most image side each have a biconvex shape.

主权项

1. An imaging lens, comprising:
a plurality of lenses, wherein, for two lenses which are arranged adjacently and separately from each other, a first surface on an image side of one of the lenses closer to an object side and a second surface on the object side of the other of the lenses closer to the image side face each other across an air space, the air space being termed an air lens, wherein a shape of the air lens is defined such that the first surface on the image side of the one of the lenses closer to the object side is taken as a first surface on the object side of the air lens and the second surface on the object side of the other of the lenses closer to the image side is taken as a second surface on the image side of the air lens, wherein the plurality of lenses includes at least first and second air lenses, the first air lens being positioned on a most object side in the imaging lens and the second air lens being positioned on a most image side in the imaging lens each have a biconvex shape, and wherein the first air lens positioned on the most object side in the imaging lens and the second air lens positioned on the most image side in the imaging lens are the only air lenses having a negative power in the imaging lens.